Oral orthodontic periodontal membrane stretching test device

Abstract

The invention relates to the technical field of tensile testing, in particular to an orthodontic periodontal membrane tensile testing device which comprises a machine table; and the protective cover is fixedly arranged on the machine table. According to the invention, through the arrangement of the adjusting mechanism, the temperature and the humidity in the protective cover are adjusted, and the uniformity of the temperature and the humidity in the protective cover is improved, so that the environment of the periodontal membrane in the oral cavity can be better simulated, and the accuracy of a tensile test result is improved; when the temperature and humidity are adjusted, different temperatures and humidity can be set, so that the periodontal ligament can be tested in different oral environments, different test results are obtained, and the mechanical property of the periodontal ligament can be better analyzed; in addition, when the temperature reaches the set threshold value, the heating plate stops heating, and when the humidity reaches the set threshold value, the humidity adjusting assembly stops running, so that the temperature and the humidity can be independently controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tensile test, in particular to a kind of oral orthodontic periodontal membrane tensile test device. BACKGROUND

[0002] Periodontal membrane (periodontal ligament, periodontal space) is composed of dense connective tissue. Most of the fibers of periodontal membrane are arranged in bundles, with one end embedded in cementum and the other end embedded in the bone wall of alveolar fossa, so as to fix the tooth in the alveolar fossa. Periodontal membrane contains nerves, blood vessels, lymph and epithelial cells. Orthodontics is to apply orthodontic force directly or indirectly to teeth and their supporting tissues, causing a series of biochemical reactions in the tissues, so as to achieve the purpose of tooth movement.

[0003] The mechanical properties (such as elastic modulus and yield strength) of periodontal membrane are significantly affected by temperature and humidity. The temperature in the oral cavity is generally between 36.5°C and 37.2°C. If the temperature deviates from this range (such as room temperature 25°C) in the experiment, different temperatures will cause the stiffness of the material to change, and the test results may be high or low. Studies have shown that for every 1°C increase in temperature, the elastic modulus of periodontal membrane may decrease by about 5%-10%. In addition, periodontal membrane contains a large amount of water, and its viscoelastic properties depend on the humidity environment. In a dry environment, the material will harden due to water loss, and the tensile strength test value may be artificially high, which cannot reflect the true mechanical behavior. Studies have shown that the tensile strength of periodontal membrane samples stored in a dry environment may be 30%-50% higher than that of wet samples.

[0004] The test device in the prior art can test the tensile strength of periodontal membrane, but it cannot simulate the environment of periodontal membrane in the oral cavity, thereby reducing the accuracy of the tensile test results.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. SUMMARY

[0006] The present application aims to provide an oral orthodontic periodontal membrane tensile test device that can effectively solve the above-mentioned technical problems.

[0007] To achieve the purpose of the present application, the following technical solutions are adopted: An oral orthodontic periodontal membrane tensile test device, comprising: a machine table; a protective cover fixedly installed on the machine table; an adjusting mechanism for adjusting the tensile test environment of oral orthodontic periodontal membrane; The adjusting mechanism comprises: a heating plate; a liquid storage tube fixedly installed in the protective cover; an atomizing nozzle hingedly installed on the liquid storage tube; a linkage spring for driving the atomizing nozzle to reset; and a suction unit for delivering water in the liquid storage tube to the atomizing nozzle. The suction unit comprises a fixed tube, a piston slidingly installed in the fixed tube, a movable rod fixedly connected with the piston, a linkage rod hingedly connected with the movable rod, a water inlet pipe communicating the fixed tube with a liquid storage tube, a water outlet pipe communicating the fixed tube with an atomizing nozzle, a rotating plate rotatably installed on the protective cover, and a second power source driving the rotating plate to rotate. The heating plate is fixedly installed on the rotating plate.

[0008] Further, the rotating plate is petal-shaped, and the top of the rotating plate is arc-shaped.

[0009] Further, the liquid storage tube is ring-shaped, the atomizing nozzle is provided with a plurality of atomizing nozzles, and the plurality of atomizing nozzles are uniformly distributed along the circumference of the liquid storage tube.

[0010] Further, the adjusting mechanism further comprises a gas collecting pipe and a gas storage tube fixedly installed on the protective cover, a gas inlet pipe communicating with the gas collecting pipe, a gas inlet cover communicating with the gas inlet pipe, a gas jet head communicating with the gas storage tube, a gas guide pipe communicating the gas collecting pipe with the fixed tube, and a gas outlet pipe communicating the gas storage tube with the fixed tube.

[0011] Further, the gas collecting pipe and the gas storage tube are both ring-shaped, and the fixed tube is fixedly connected with the gas collecting pipe.

[0012] Further, the gas jet head is provided with a plurality of gas jet heads, and the plurality of gas jet heads are uniformly distributed along the circumference of the gas storage tube.

[0013] Further, it further comprises a fixing mechanism for fixing during oral orthodontic periodontal membrane stretching test. The fixing mechanism comprises an upper fixing combination, a lower fixing combination, and a rotating assembly driving the upper fixing combination and the lower fixing combination to rotate. The upper fixing combination and the lower fixing combination are both provided with a plurality of groups, and the plurality of groups of the upper fixing combination are matched with the plurality of groups of the lower fixing combination.

[0014] Further, the rotating assembly comprises a first power source fixedly installed in the machine table, a rotating shaft fixedly installed at the output end of the first power source, a driving gear fixedly sleeved on the rotating shaft, a driven gear meshingly connected with the driving gear, a first disc coaxially connected with the driven gear, and a second disc coaxially connected with the driven gear.

[0015] Further, the plurality of groups of the upper fixing combination are all fixedly installed on the first disc, and the plurality of groups of the upper fixing combination are uniformly distributed along the circumference of the first disc.

[0016] Further, the plurality of groups of the lower fixing combination are all fixedly installed on the second disc, and the plurality of groups of the upper fixing combination are uniformly distributed along the circumference of the second disc.

[0017] Compared with the prior art, the present application has the following beneficial effects: The oral orthodontic periodontal membrane tensile testing device of the present application can better simulate the environment of the periodontal membrane in the oral cavity by adjusting the temperature and humidity in the protective cover and improving the uniformity of the temperature and humidity in the protective cover, thereby improving the accuracy of the tensile test results; different temperatures and humidities can be set when adjusting the temperature and humidity, so that the periodontal membrane can be tested in different oral environments to obtain different test results, thereby better analyzing the mechanical properties of the periodontal membrane; in addition, when the temperature reaches the set threshold, the heating plate stops heating, and when the humidity reaches the set threshold, the humidity adjusting assembly stops running, so that the temperature and humidity can be controlled separately. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, but do not limit the present application.

[0019] Figure 1 is a perspective view of the oral orthodontic periodontal membrane tensile testing device of the present application; Figure 2 is a perspective view of the machine table of the oral orthodontic periodontal membrane tensile testing device of the present application; Figure 3 is a perspective view of the air collecting pipe of the oral orthodontic periodontal membrane tensile testing device of the present application; Figure 4 is a sectional view of the air collecting pipe of the oral orthodontic periodontal membrane tensile testing device of the present application; Figure 5 is a perspective view of the air collecting pipe of the oral orthodontic periodontal membrane tensile testing device of the present application; Figure 4 is an enlarged view of A in the middle; Figure 6 is a sectional view of the rotating plate of the oral orthodontic periodontal membrane tensile testing device of the present application.

[0020] In the drawings: 1. Machine; 2. Protective cover; 3. Fixing mechanism; 31. Upper fixing assembly; 32. Lower fixing assembly; 33. Rotating assembly; 331. Power source 1; 332. Driving gear; 333. Driven gear; 334. First disc; 335. Second disc; 4. Adjusting mechanism; 41. Humidity adjustment assembly; 411. Liquid storage tube; 412. Atomizing nozzle; 413. Linking spring; 414. Suction unit; 41 41. Fixed pipe; 4142. Piston; 4143. Movable rod; 4144. Connecting rod; 4145. Water inlet pipe; 4146. Water outlet pipe; 4147. Power source 2; 4148. Rotating plate; 42. Temperature regulating assembly; 421. Gas collecting pipe; 422. Inlet hood; 423. Inlet pipe; 424. Air guide pipe; 425. Outlet pipe; 426. Gas storage pipe; 427. Injector head; 428. Heating plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0022] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] like Figures 1 to 6 As shown, an orthodontic periodontal ligament tensile testing device of the present invention includes: a machine platform 1; a protective cover 2 fixedly mounted on the machine platform 1; and an adjustment mechanism 4 for adjusting the orthodontic periodontal ligament tensile testing environment.

[0024] A temperature and humidity sensor (not shown) is installed in the protective cover 2, so that the temperature and humidity in the protective cover 2 can be detected. According to the detection results of the temperature and humidity, the staff can start the adjusting mechanism 4 to adjust the temperature and humidity in the protective cover 2, so as to better simulate the environment of the periodontal ligament in the oral cavity and improve the accuracy of the tensile test results.

[0025] The protective cover 2 is mainly composed of a heat preservation box body and a sealing door. During testing, the sealing door is closed, which can effectively avoid heat loss and avoid waste of energy. The sealing door is provided with an observation window, which is convenient for the staff to observe the testing process in real time.

[0026] The adjusting mechanism 4 comprises a humidity adjusting assembly 41 for adjusting humidity. The humidity adjusting assembly 41 comprises a liquid storage pipe 411 fixedly installed in the protective cover 2, and a plurality of atomizing nozzles 412 hingedly installed on the liquid storage pipe 411. The liquid storage pipe 411 is annular, and the atomizing nozzles 412 are evenly distributed along the circumference of the liquid storage pipe 411. The adjusting mechanism 4 further comprises a linkage spring 413 for driving the atomizing nozzles 412 to reset, one end of the linkage spring 413 being fixedly connected with the atomizing nozzles 412, and the other end of the linkage spring 413 being fixedly connected with the liquid storage pipe 411. The adjusting mechanism 4 further comprises a suction unit 414 for conveying water in the liquid storage pipe 411 to the atomizing nozzles 412.

[0027] The suction unit 414 comprises a fixed pipe 4141, a piston 4142 slidingly installed in the fixed pipe 4141, an activity rod 4143 fixedly connected with the piston 4142 and penetratingly installed on the fixed pipe 4141, a sealing ring being installed on the penetration of the fixed pipe 4141, a linkage rod 4144 hingedly connected with the activity rod 4143, a water inlet pipe 4145 communicating the fixed pipe 4141 with the liquid storage pipe 411 and being provided with a first one-way valve, a water outlet pipe 4146 communicating the fixed pipe 4141 with the atomizing nozzles 412 and being provided with a second one-way valve, a rotating plate 4148 rotatably installed on the protective cover 2, and a power source two 4147 for driving the rotating plate 4148 to rotate.

[0028] The rotating plate 4148 is petal-shaped, and the top of the rotating plate 4148 is arc-shaped.

[0029] When the humidity is adjusted, the power source two 4147 drives the rotating plate 4148 to rotate, and when the rotating plate 4148 rotates, it can drive the atomizing nozzle 412 to move along the petal-shaped edge thereof, and cooperate with the elastic force of the connecting spring 413 to make the plurality of atomizing nozzles 412 synchronously fold inward or expand outward, that is, the swinging of the atomizing nozzle 412 is realized, and the spraying range of the atomizing nozzle 412 is expanded, which is beneficial to uniformly spraying the water mist in the protective cover 2, so that the humidity in the protective cover 2 is uniform.

[0030] The piston 4142 divides the fixed pipe 4141 into two independent cavities, one of which stores air near the atomizing nozzle 412, and the other of which stores liquid away from the atomizing nozzle 412.

[0031] When the atomizing nozzle 412 swings, it can drive the connecting rod 4144 to reciprocate, the connecting rod 4144 drives the movable rod 4143 to reciprocate, and the movable rod 4143 drives the piston 4142 to reciprocate in the fixed pipe 4141; when the piston 4142 is close to the atomizing nozzle 412, the first one-way valve is opened and the second one-way valve is closed, at this time the water in the liquid storage pipe 411 enters the fixed pipe 4141 through the water inlet pipe 4145; When the piston 4142 is away from the atomizing nozzle 412, the piston 4142 can extrude the water in the fixed pipe 4141, at this time the first one-way valve is closed and the second one-way valve is opened, the water in the fixed pipe 4141 enters the atomizing nozzle 412 through the water outlet pipe 4146 and is atomized and sprayed out, so that the atomizing nozzle 412 swings at the same time, drives the suction unit 414 to operate, thereby realizing the automatic delivery of water in the liquid storage pipe 411 to the atomizing nozzle 412 without manual intervention, and improving the automation degree of the device.

[0032] In addition, when the power source two 4147 drives the rotating plate 4148 to rotate at a high speed, it can drive the atomizing nozzle 412 to swing quickly, thereby driving the piston 4142 to reciprocate quickly, improving the efficiency of automatically delivering water in the liquid storage pipe 411 to the atomizing nozzle 412, thereby realizing rapid increase of the humidity in the protective cover 2. Due to the rapid swinging of the atomizing nozzle 412, the water mist is sprayed uniformly, thereby further improving the humidity uniformity of the protective cover 2.

[0033] The humidity is detected in real time by the temperature and humidity sensor, and two threshold values, i.e. a first threshold value and a second threshold value, are set by the temperature and humidity sensor, and the first threshold value is less than the second threshold value, and the second threshold value is the required humidity range.

[0034] When the humidity reaches the first threshold value, the power source two 4147 drives the rotating plate 4148 to rotate at a reduced speed, thereby reducing the humidification speed, and when the humidity reaches the second threshold value, the power source two 4147 stops running, thereby facilitating the control of the humidification speed, and further facilitating the accurate control of the humidity.

[0035] It is to be supplemented here that the power source two 4147 is preferably an electric motor; the control of the power source two 4147 is prior art and is not described here.

[0036] The adjusting mechanism 4 further comprises a temperature adjusting assembly 42 for adjusting temperature; the temperature adjusting assembly 42 comprises a gas collecting pipe 421 fixedly installed on the protective cover 2, a gas storage pipe 426, an air inlet pipe 423 in communication with the gas collecting pipe 421, an air inlet cover 422 in communication with the air inlet pipe 423, a gas jet head 427 in communication with the gas storage pipe 426, a gas guide pipe 424 in communication with the gas collecting pipe 421 and the fixed pipe 4141, the third one-way valve being installed on the gas guide pipe 424, an air outlet pipe 425 in communication with the gas storage pipe 426 and the fixed pipe 4141, the fourth one-way valve being installed on the air outlet pipe 425, and a heating plate 428 fixedly installed on the rotating plate 4148, the heating plate 428 being provided with a plurality of heating plates 428 and being uniformly distributed along the axial direction of the rotating plate 4148; the gas collecting pipe 421 and the gas storage pipe 426 are annular, the fixed pipe 4141 is fixedly connected with the gas collecting pipe 421, and the gas jet head 427 is provided with a plurality of gas jet heads 427 and is uniformly distributed along the circumferential direction of the gas storage pipe 426.

[0037] When the humidity is adjusted, the temperature is also adjusted, that is, the air in the protective cover 2 is heated by starting the heating plate 428, and the gas is transported by the reciprocating movement of the piston 4142.

[0038] When the rotating plate 4148 rotates, the heating plate 428 can be driven to rotate, so that the air at the top of the protective cover 2 can be uniformly heated, and the rotation of the heating plate 428 can drive the air at the top of the protective cover 2 to flow, thereby improving the uniformity of heating.

[0039] When the piston 4142 is away from the atomizing nozzle 412, a negative pressure is generated in the cavity storing air, at this time the third one-way valve is opened and the fourth one-way valve is closed, so that the air in the gas collecting pipe 421 is transported into the fixed pipe 4141 through the gas guide pipe 424; When the piston 4142 is close to the atomizing nozzle 412, the piston 4142 extrudes the air in the fixed pipe 4141, at this time the third one-way valve is closed and the fourth one-way valve is opened, at this time the air in the fixed pipe 4141 enters the gas storage pipe 426 through the air outlet pipe 425, and is sprayed out through the plurality of gas jet heads 427; The air is sprayed out from top to bottom, so that the air heated by the heating plate 428 can be blown downward, thereby making the temperature in the protective cover 2 uniform.

[0040] Air is sprayed on the rotating plate 4148 by the air jet 427, and since the top of the rotating plate 4148 is arc-shaped, the air sprayed on the rotating plate 4148 is guided to disperse in all directions, so that the hot air is driven to disperse in all directions along the top of the rotating plate 4148, thereby accelerating the uniform distribution of the hot air and further improving the uniformity of the temperature in the protective cover 2.

[0041] In addition, the dispersion of the hot air along the top of the rotating plate 4148 can drive the water mist to disperse quickly, thereby further improving the uniformity of the humidity in the protective cover 2.

[0042] The air inlet cover 422 is arranged near the bottom of the protective cover 2, so that the air at the bottom of the protective cover 2 is sucked into the air collecting pipe 421, thereby forming a circulating flow of air in the protective cover 2 and further improving the uniformity of the humidity in the protective cover 2.

[0043] It is supplemented here that the heating plate 428 is preferably an electric heating plate 428.

[0044] In the present application, the temperature and humidity in the protective cover 2 are adjusted by the adjusting mechanism 4, and the uniformity of the temperature and humidity in the protective cover 2 is improved, so that the environment of the periodontal ligament in the oral cavity can be better simulated, and the accuracy of the tensile test result is improved. When the temperature and humidity are adjusted, different temperatures and humidities can be set, so that the periodontal ligament can be tested in different oral environments, and different test results can be obtained, so that the mechanical properties of the periodontal ligament can be better analyzed. In addition, the temperature is adjusted by heating the air in the protective cover 2 by the heating plate 428, and the humidity is adjusted by spraying water mist in the protective cover 2 by the humidity adjusting assembly 41, when the temperature reaches the set threshold value, the heating plate 428 stops heating, when the humidity reaches the set threshold value, the humidity adjusting assembly 41 stops running, so that the temperature and humidity can be controlled separately.

[0045] It also includes a fixing mechanism 3 for fixing the oral orthodontic periodontal ligament during tensile testing.

[0046] The upper fixing assembly 31 and the lower fixing assembly 32 in the present application are the same as the upper fixing assembly 31 and the lower fixing assembly 32 in the Chinese patent with the application number CN202410421024.8, which belongs to the prior art.

[0047] The upper fixing assembly 31 is provided with a plurality of electric push rods, the plurality of upper electric push rods are embeddedly installed on the outer periphery of the upper circular pipe, the plurality of upper electric push rods are arranged in a ring array, the moving part of the plurality of upper electric push rods is connected with an upper clamping plate for clamping the fixed dental crown, the shape of the upper clamping plate is set as L-shaped, the different degrees of elongation of the plurality of upper electric push rods can be controlled, and different styles of dental crowns can be targeted.

[0048] The lower fixing assembly 32 is provided with a plurality of lower electric push rods, the plurality of lower electric push rods are embeddedly installed on the outer periphery of the lower circular pipe, the plurality of lower electric push rods are arranged in a ring array, the moving part of the plurality of upper electric push rods is connected with a lower clamping plate for clamping the alveolar bone, the shape of the lower clamping plate is also set as L-shaped, and the different degrees of elongation of the plurality of lower electric push rods of the lower fixing assembly 32 can be targeted for different styles of alveolar bones.

[0049] The orientations of the upper clamping plate and the lower clamping plate are different, the upper clamping plate and the lower clamping plate are both provided with anti-skid lines, the dental crown is large at the top and small at the bottom, and is fixed by the L-shaped upper clamping plate, the alveolar bone is in a circular vortex shape, and the L-shaped lower clamping plate can clamp and pull the alveolar bone.

[0050] Through the cooperation of the upper fixing assembly 31 and the lower fixing assembly 32, the periodontal membrane of the oral orthodontic tooth can be stretched and tested.

[0051] Since the upper fixing assembly 31 and the lower fixing assembly 32 are both provided with a plurality of groups, the plurality of groups of upper fixing assemblies 31 and the plurality of groups of lower fixing assemblies 32 are matched; thus, a plurality of groups of periodontal membranes of the oral orthodontic tooth can be stretched and tested, and the test efficiency is improved.

[0052] The rotating assembly 33 comprises: a power source one 331 fixedly installed in the machine table 1; a rotating shaft fixedly installed at the output end of the power source one 331; a driving gear 332 fixedly sleeved on the rotating shaft, the driving gear 332 is provided with two; a driven gear 333 engagedly connected with the driving gear 332, the driven gear 333 is provided with two, the upper driven gear 333 is rotatably installed on the fixed plate, the fixed plate is fixedly installed in the protective cover 2, and the lower driven gear 333 is rotatably installed on the machine table 1; a first disc 334 and a second disc 335 coaxially connected with the driven gear 333; a plurality of groups of upper fixing assemblies 31 are fixedly installed on the first disc 334, and the plurality of groups of upper fixing assemblies 31 are uniformly distributed along the circumference of the first disc 334; a plurality of groups of lower fixing assemblies 32 are fixedly installed on the second disc 335, and the plurality of groups of upper fixing assemblies 31 are uniformly distributed along the circumference of the second disc 335.

[0053] When the oral orthodontic periodontal membrane is stretched for testing, a plurality of oral orthodontic periodontal membranes are fixed, and the power source 331 is started to drive the driving gear 332 to rotate, the driving gear 332 drives the driven gear 333 to rotate, so that the first disc 334 and the second disc 335 can be driven to rotate synchronously, and the lower fixed combination 32 and the upper fixed combination 31 can be driven to rotate synchronously, so that a group of oral orthodontic periodontal membranes are driven to approach the sealing door of the protective cover 2, and the group of oral orthodontic periodontal membranes are stretched for testing.

[0054] When the group of oral orthodontic periodontal membranes is tested, the power source 331 is started to move another group of oral orthodontic periodontal membranes close to the sealing door of the protective cover 2, and the group of oral orthodontic periodontal membranes are stretched for testing.

[0055] As can be seen from the above, a plurality of oral orthodontic periodontal membranes can be sequentially stretched for testing, thereby solving the problem that the test device in the prior art can only test one periodontal membrane at a time, improving the test efficiency, and avoiding the frequent opening of the sealing door, causing the temperature and humidity in the protective cover 2 to fluctuate, thereby avoiding the problem of frequent adjustment of the temperature and humidity of the protective cover 2, and improving the convenience of use.

[0056] It is supplemented here that the power source 331 is preferably an electric motor.

[0057] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, and the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection mode in the prior art, which will not be described in detail here, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0058] It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An orthodontic periodontal ligament tensile testing device, characterized in that: include: Machine; A protective cover fixedly mounted on the machine platform; An adjusting mechanism for adjusting an environment for an orthodontic periodontal ligament tensile test; The regulating mechanism includes: a heating plate; a liquid storage tube fixedly mounted in the protective cover; an atomizing nozzle hingedly mounted on the liquid storage tube; a linkage spring for driving the atomizing nozzle to return to its original position; and a suction unit for transporting water in the liquid storage tube to the atomizing nozzle. The suction unit includes: a fixed tube; a piston slidably mounted in the fixed tube; a movable rod fixedly connected to the piston; a connecting rod hingedly connected to the movable rod; a water inlet pipe connecting the fixed tube and the liquid storage pipe; a water outlet pipe connecting the fixed tube and the atomizing nozzle; a rotating plate rotatably mounted on the protective cover; and a second power source for driving the rotating plate to rotate. The heating plate is fixedly mounted on the rotating plate.

2. The orthodontic periodontal ligament tensile testing device according to claim 1, characterized in that: The rotating plate is in a petal shape, and the top of the rotating plate is arranged in an arc shape.

3. The orthodontic periodontal ligament tensile testing device according to claim 1, characterized in that: The liquid storage pipe is annular, and a plurality of atomizing nozzles are provided, and the plurality of atomizing nozzles are evenly distributed along the circumference of the liquid storage pipe.

4. The orthodontic periodontal ligament tensile testing device according to claim 1, characterized in that: The regulating mechanism also includes: an air collecting pipe and an air storage pipe fixedly mounted on the protective cover; an air intake pipe connected to the air collecting pipe; an air intake cover connected to the air intake pipe; an injection nozzle connected to the air storage pipe; an air guide pipe connecting the air collecting pipe and the fixed pipe; and an air outlet pipe connecting the air storage pipe and the fixed pipe.

5. The orthodontic periodontal ligament tensile testing device according to claim 4, characterized in that: The gas collecting pipe and the gas storage pipe are both ring-shaped, and the fixed pipe is fixedly connected to the gas collecting pipe.

6. The orthodontic periodontal ligament tensile testing device according to claim 5, characterized in that: A plurality of the air jet heads are provided, and the plurality of the air jet heads are evenly distributed along the circumference of the air storage pipe.

7. The orthodontic periodontal ligament tensile testing device according to claim 1, characterized in that: Also includes: A fixing mechanism for fixing during tensile testing of the periodontal ligament in orthodontics; The fixing mechanism includes: an upper fixing assembly; a lower fixing assembly; and a rotating assembly that drives the upper fixing assembly and the lower fixing assembly to rotate; The upper fixing assembly and the lower fixing assembly are both provided with a plurality of groups, and a plurality of groups of the upper fixing assembly are matched with a plurality of groups of the lower fixing assembly.

8. The orthodontic periodontal ligament tensile testing device according to claim 7, characterized in that: The rotating assembly includes: a power source 1 fixedly installed in the machine; a rotating shaft fixedly installed at the output end of the power source 1; a driving gear fixedly sleeved on the rotating shaft; a driven gear meshing with the driving gear; and a first disc and a second disc coaxially connected to the driven gear.

9. An orthodontic periodontal ligament tensile testing device as claimed in claim 8, characterized in that: The plurality of upper fixing assemblies are all fixedly mounted on the first disc, and the plurality of upper fixing assemblies are evenly distributed along the circumference of the first disc.

10. The orthodontic periodontal ligament tensile testing device according to claim 9, characterized in that: The plurality of groups of the lower fixed assemblies are all fixedly mounted on the second disc, and the plurality of groups of the upper fixed assemblies are evenly distributed along the circumference of the second disc.

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